Acoustic diaphragm.



w. w. YOUNG. I] ACOUSTIC DIAPHRAGM.

- APPLICATION FILED MARIQB, 1910.

" 975,596. 1 Patent d Nov. 15, 1910.

fps l- T113. I 7 F113... 4:

A froze/mm;

an mal) strairns Paras @FFICE.

WILLIAM YOUNG, GE SPRXNGFZELD, MASSACHUSETTfzL ACOUSTIC DIAPHRAGM.

Applicationfiled March 28, 1910. Serial No. 552,017. r

boxes of talkin -machines, althou' h by no means restricted to suohuse,an consists essentially of a perforated disk of'suitable material whichhas irregular or broken surfaces and'also has burs formed thereon, a

thin covering or coverings of suitable mate-- rial on such disk for theperforations th'ere- 'in, and'a'suitable coating of material or 20materials capable of being applied in s'olu tion andthen hardening uponsaid disk and in such perforations and said covering or coverings, thelatter being permeable by such solution, all as hereinafter set-forth. a

The above-mentioned coating should be of a nature which insures the:required'pernianent unity between it and the parts to which it isappliedwhile in solution and which adds materially to the excellency,efficiency, and value of the diaphragm By the term solution, as hereinemployed, is meant'any compound einulsion, or any character of mixtureof suitablecomposition toproduce the hard, permanent, and exceedinglyadvantageous or beneficial coating to which special attention has beencalled.

The object of my invention is to produce an acoustic diaphragm, of theabove indicated class, which possesses practically all ofthe desirableas well as the essential characteristics and qualities of a device ofthis kind, among which characteristics or qualities may bementioned'durability and stability, resil ency and resonance, capability of givingout clear, loud and distinct tones of great volume and depth, and ofevenly distributing the sound waves, and immunity from blasts andscratching sounds andother alien and discordant noises.

Other objects will appear in the course of the following description.

I attain the objects and secui'ethe advan tages of my invention by themeans illustrated in the a'ccompanying drawings, in which--- Figure 1 isaside view of one form of Specification of illetters Patent.

-device.-;-' I

1S1In1lar figures? refer'ito similar -partse throughout the severalviews.

disk that, maybe used ini'ny invention; Fig. 2, a ,,s1n11-lar view of-asimilar. disk fora Patented Nov.--15, 1910.

similarpurpose, but slightly modified; Fig.

3, a side view of a finished diaphrag nyl 1g..- 4, a side v ew of aslightly modifiedfform of, f

diaphragm, and, Fig. 5, a greatly. enlarged center-pf a diaphragm whichembodiesthe aforesaid invention in a practical form, as do in partaor inwhole the other. v1ews..

and exaggerated cross-section through the Some of the covering andsomebf they",

coatingv are omitted from-the last vi'ewpbut' it willibe understood thatin; reality the'fcovr ering extends to the right of the center, over theburs, as far .as itdoes tothe left ofgthe, center,'iandtheacoating isover the entire Diaphragi'ns such as mine;arcinvariably round, henceasmember lin the shape of a has its surfaces broken up, by 'pebbling oremployed by me as the baseor major at 'ele nent ot my invention; Thisdisk is thin,

pitting, as represented at 2, is provided with a number of burs 3 whichare struck out of,

said diskg andis perforated'so as .toform a number of clean-cut-holesdtherein or there, through. The center of they disk Lm'aybe f leftundisturbed, save for the pitsQandthe corresponding'convexities or.protuberances, I

as shown in Fig.1, or said; center may be dished on one side andcorrespondingly--- bulged on the other side, as shown at 5.111

the other views.

The holes 4- are transformed iutoavhat may be termed-lesser diaphragmsbymeans i of one or more very thin coverings 6 and a coating 7. In Fig.3'there is one of these coverings 6 for each hole 4, while inFig. 4:"

only one such covering is employed, each covering 111 the first instancebeing concentrio with its hole, and the single covering, in

the second instance being concentric withthe disk 1. \Vhen the singlecovering is used, it may be larger than the one shownin Fig. 4, as muchlarger as may be desired up to thegfull superficial area of thediskp'sis. not of vital importance, for the sake ofia y. to make them round.

1. Although the shape'o't thecovcrin pearance I prefer The coating 7 ison both sides of the disk 1 and the covering or coveringsG,'and is th'emedium by means of which the latter are fixed to the former.

'The disk 1 may be made of a variety of ticulars is permissible.

different kinds of metallic and non-metallic materials, but any materialto be adaptable for the purpose should be thin, of course, and must becapable of receiving and retaining the coating 7 and possess thenecessar ualities of then producing the required c tect. Thin sheet-aluminum and pure'linenfiber'paper or cardboard are among the bestmaterials and -givesomc of the best results.

The pits 2 and the convexities or protuberances produced thereby ,aregenerally very numerous, quite' small, and close togther, although somevariation in these parl- Their arrangement may be regular or irregular,as desired. An unbroken ring 8 may be left on each side of the disk 1,outside of the pits and protuberances. These plane-surface rings 8afford smooth, sound-box connecting bearings for the dia hragm.

The urs 3 are formed by punching thein out of the disk 1 in such a wayas to leave smooth, hollow, conical protuberances, through the smallends of which will be usually minute openings. These burs are preferablyarranged radially around the dished center, or a corres onding area, of

the disk 1, four (more or ess) to a radius,

has

with a hole 4} between adjacent radii, substantially as shown, but thisorder or arrangement of burs and holes is subject to some modification,and the number of holes as well as the number of burs may be changed.

The holes 4 will, as a rule, be round, although this is not imperative,and there may be considerable variation in their size.

I use for the covering or coverings 6 very thin fabric, such astissue-paper.

The material or combination of materials used for the coating 7, andwhich is applied in any suitable manner to both sides of the disk 1 withits covering or coverings 6, must be of such a nature that it willadhere firmly to and intimately and permanently unite with the parts,and also fix such covering or coverings securely to said disk;furthermore, the nature of the coating must be such that it will sounite with the other'elements and of 'zinc,and an earth cement, mixedtogether with the roportions of about one part each of the oxid ofzincand the cement to about twenty parts of the silicate of soda orsilicate of potash. These proportions may vary to mately its entirearea, provi a considerable extent without seriously atfecting theefiiciency of the resulting coatmg. I

As I am aware that other coating substances or materials will give thedesired r sults, I do not intend to restrict myself to anyparticularcoating substance or mate: rial or combination of the same suitable forthe purpose.

Each of the elements or features herein described and which togethermake up this diaphragm, with the possible exception in some cases of thedished center, is indispensable tothe attainment of the desired end, asI have found by long and careful experiment, the pits, burs, lesserdiaphragms, and coating each contributing something essen tial'to theperfection required of an acoustic diaphragm designed for talkingmachinewith the dished center. 1

In practice, the pits and their protuberances are usually finer thanthey appear in the drawings.-

In addition to the variations or modifications already noted others maybe made without departing from the nature of my invention.

What I claim as m invention, and desire to secure by Letters atent, is-

1. A disk, for a diaphragm of the class described, consisting ofa pittedmember having burs thereon and holes therethrough independent of the buropenings.

2. A disk, for a diaphragm of the class described, consisting of amember having its structure broken up throu hout approxided with burs,and having holes independent of the bur openings.

3. A disk, for a diaphragm of the class described, consisting of amember having protuberances over approximately the entire superficialarea of its sides, provided with burs, and having holes'independent ofthe bur o enings.

4. dis for a diaphragm of the class described, consisting of a pittedmember having burs thereon and holes therethrough independent of the buropenings, and provided with a dished center, such burs and holes beinglocated between said dished center and the periphery of said member.

5. A diaphragm, of the class described, consisting of a pitted diskhaving burs thereon and holes therethroughindependent of the buropenings, covering material on such disk for such holes, and a hardoverlying coating on said disk and covering material covering materialwith the disk.

6. A diaphra 0 the class described, consisting of a pitted disk havingburs thereon and holes therethrough independent of and analogouspurposes. And injmany if. not most instances, 1t is not well to dispenseand in the disk perforations and uniting said the bur openings, and'provided with a on and holes therethrough independent of dished center,such burs and holes being 10- the bur openings, covering matemai on suchcated between said dished center and the pedisk for such holes, and ahard overlying rip'hery of said disk, covering material on coating onsaid disk and covering materiai 5 such disk for such holes, and a hardoversaid covering material with the coating 15 lying coating on saiddisk and covering thereon forming lesser d igphragmsi material and inthe disk perforations and W. YUUNG,

uniting said covering material With the disk. Witnesses: a

7. A diaphragm, of the class described, 1 31A. CUTTER,

1e consisting of apitted disk having burs there- 1 -A. C. .FAIRBANKS.

